Systems and Method for Skin Analysis Using Electronic Devices

1. A system for calibrating a moisture sensor, that can be pressed into contact with a test subject's skin at an unknown pressure when obtaining a moisture sensor reading, where pressure affects the moisture sensor reading, the system comprising: the moisture sensor, configured to provide moisture sensor readings; and an electronic device comprising: a camera; and a skin characteristic application stored on a tangible computer-readable medium such that the skin characteristic application, when executed by a processor, causes the electronic device to: while the moisture sensor is pressed into contact with the test subject's skin at a first pressure, obtain a first picture of the test subject's skin and record i) a first focal length of the camera when the first picture was obtained and ii) a first moisture sensor reading of the test subject's skin from the moisture sensor; while the moisture sensor is pressed into contact with the test subject's skin at a second pressure that is different from the first pressure, obtain a second picture of the test subject's skin and record i) a second focal length of the camera when the second picture was taken and ii) a second moisture sensor reading of the test subject's skin from the moisture sensor; calculate a pressure-based moisture adjustment slope; and, apply a pressure-based moisture adjustment factor based on the pressure-based moisture adjustment slope to a future moisture sensor reading, taken at a future focus distance, to arrive at an adjusted future moisture sensor reading.

2. The system of claim 1 wherein the skin characteristic application, when executed by a processor, is further configured to cause the electronic device to: determine the pressure-based moisture adjustment slope using a first (x, y) coordinate where x is the first focal length and y is the first moisture sensor reading and a second (x, y) coordinate where x is the second focus distance and y is the second moisture sensor reading; and quantify an average focus distance from the first focus distance and the second focus distance.

3. The system of claim 2 wherein the applying further comprises: solving a slope point form equation of a form Y−Y1=m(X−X1), where Y is the adjusted future moisture sensor reading; Y1 is the future moisture sensor reading; m is the pressure-based moisture adjustment slope; X is the average focus distance; and X1 is the future focus distance.

4. The system of claim 3 wherein the skin characteristic application is further configured to: prompt a user to select a first focal point near a middle of a display of the electronic device that is previewing the first picture; and accept a user input selecting the focal point as a trigger to take a picture.

5. The system of claim 1 wherein the test subject is a user of the electronic device.

6. The system of claim 1 wherein the second pressure is lighter than the first pressure.

7. The system of claim 6 wherein the skin characteristic application, when executed, is further configured to cause the electronic device to: determine the pressure-based moisture adjustment slope using a first (x, y) coordinate where x is the first focal length and y is the first moisture sensor reading and a second (x, y) coordinate where x is the second focus distance and y is the second moisture sensor reading; and quantify an average focus distance from the first focus distance and the second focus distance.

8. The system of claim 7 wherein the applying further comprises: solving a slope point form equation of a form Y−Y1=m(X−X1), where Y is the adjusted future moisture sensor reading; Y1 is the future moisture sensor reading; m is the pressure-based moisture adjustment slope; X is the average focus distance; and X1 is the future focus distance.